package com.admin.web.controller.system;

import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;
import com.admin.common.core.controller.BaseController;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import javax.annotation.Resource;
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.image.BufferedImage;
import java.io.IOException;

/**
 * 图片验证码（支持算术形式）
 *
 * @author fangchen
 */
@Controller
@RequestMapping("/captcha")
public class SysCaptchaController extends BaseController {
    @Resource(name = "captchaProducer")
    private Producer captchaProducer;

    @Resource(name = "captchaProducerMath")
    private Producer captchaProducerMath;

    /**
     * 验证码生成
     */
    @GetMapping(value = "/captchaImage")
    public ModelAndView getKaptchaImage(HttpServletRequest request, HttpServletResponse response) {
        ServletOutputStream out = null;
        try {
            HttpSession session = request.getSession();
            response.setDateHeader( "Expires", 0 );
            response.setHeader( "Cache-Control", "no-store, no-cache, must-revalidate" );
            response.addHeader( "Cache-Control", "post-check=0, pre-check=0" );
            response.setHeader( "Pragma", "no-cache" );
            response.setContentType( "image/jpeg" );

            String type = request.getParameter( "type" );
            String capStr = null;
            String code = null;
            BufferedImage bi = null;
            if ("math".equals( type )) {
                String capText = captchaProducerMath.createText();
                capStr = capText.substring( 0, capText.lastIndexOf( "@" ) );
                code = capText.substring( capText.lastIndexOf( "@" ) + 1 );
                bi = captchaProducerMath.createImage( capStr );
            } else if ("char".equals( type )) {
                capStr = code = captchaProducer.createText();
                bi = captchaProducer.createImage( capStr );
            }
            session.setAttribute( Constants.KAPTCHA_SESSION_KEY, code );
            out = response.getOutputStream();
            ImageIO.write( bi, "jpg", out );
            out.flush();

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (out != null) {
                    out.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return null;
    }
}